After this and that, I think I found the answer!
else if(status === Strophe.Status.CONNECTED){
//get roster
var iq = $iq({type: 'get'}).c('query', {xmlns: 'jabber:iq:roster'});
Chat.connection.sendIQ(iq, Chat.on_roster);
//on chat
Chat.connection.addHandler(Chat.on_message,null, "message", "chat");
$("#presence").html("Connection SID" + Chat.connection.sid + "Connection RID" + Chat.connection.rid);
}